28 lines
375 B
C++
28 lines
375 B
C++
#include<iostream>
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#include<algorithm>
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#include<string.h>
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using namespace std;
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int main()
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{
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int a[1001],n,m,i;
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memset(a,0,sizeof(a));
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cin>>n;
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int count=0;
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for(i=1;i<=n;i++)
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{
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cin>>m;
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a[m]++;
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}
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for(i=1;i<=1000;i++)
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if(a[i]!=0) count++;
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cout<<count<<endl;
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for(i=1;i<=1000;i++)
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if(a[i]!=0) cout<<i<<' ';
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return 0;
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}
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/**
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100 765
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19485
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*/
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